78 K. Takahaahi 



adinodaphnii Takah. (Aphididae of Forniosa-l, p. 85) in tliu followiug characters: 

 (1) Body elongate. (2) Wingless females yellowish green. Winged ones 

 broM'nish, with black markings on the dorsum. (3) Eyes of the wingless form 

 more rudimentary. (4)Antennae of the winged form provided with more seusoria. 

 (5) Cornicles smaller, situated on very sliallow cones. 



Genus Oregma 

 Key to Formosaa species 

 ( 1 ) Green. Horns on the head always rounded at the tip. The 8th 



abdominal segment with 2 rows of wax-pores (2) 



Usually brownish or blackish. Horns usually sharjjly pointed at 



the ajjex. The 8th abdominal segment when provided with wax- 

 pores witli a group of them ou the dorsum (3) 



( 2 ) Middle area of the dorsum of body dark green. 0. formasdna n. sp. 



Body on the dorsum with a pair of longitudinal dark green pat- 

 ches which are usually interrupted at midlength 0. bambusi/oliae Takah. 



( 3 ) Body not depressed, without well-developed wax-j)ores 



0. hamhusicola Takah. 



Body rather depressed or not so, provided with well-developed 



wax-pores (4) 



( 4 ) Body not depressed, without well-developed wax-pores on the head, 

 thorax and basal abdominal segments, but provided with them on 

 the 6th, 7th and 8th abdominal segments 0. alexanderi n. sp. 



Body depressed or not so, provided with well-developed wax-pores 



on the thorax and basal abdominal segments. (5) 



( 5 ) Tliorax and basal abdominal segments furnished with latral as 



well as dorsal wax-pores. (6) 



Tliorax and basal abdominal segments furnished only with lateral 



wax-pores (8) 



( (5 ) Horns on the head I'ouuded at the tip 0. panicola Takali. 



Horns sharjily pointed (7) 



( 7 ) Body rather depressed, with the well-developed wax-pores larger 



in diameter than the apex of the cornicle 0. pscudomontana n. sp. 



Body not depressed, with the well-developed wax-pores as large in 



diameter or smaller than the apex of the cornicle. 0. Jcoshunensis n. sp. 



( 8 ) Yellowish or dark greenish 0. laniyera Zehnt. 



